system.NullReferenceException: Object reference not set to an instance of an object, When migrating workitems having changeset,

[kannnababu]

While migrating workitems which is having Changeset, I am getting below error
System.NullReferenceException: Object reference not set to an instance of an object

When the above issue occurs, it occasionally skips it and moves on to the next work item, but other times it stops at that work item and cancels the job.
My requirement,

1. it should go to the next work item even if the above issue occurs. Is it feasible?
2. Else When migrating to the target, is it possible to skip the changeset under workitem?

Below is my configuration

"Processors": [
{
"ProcessorType": "TfsWorkItemMigrationProcessor",
"Enabled": true,
"UpdateCreatedDate": true,
"UpdateCreatedBy": true,
"WIQLQuery": "SELECT [System.Id] FROM WorkItems WHERE [System.TeamProject] = @teamproject AND [System.WorkItemType] NOT IN ('Test Suite', 'Test Plan','Code Review Request','Shared Steps','Shared Parameter','Feedback Request','Code Review Response') AND [System.ID] = 437613 ORDER BY [System.ChangedDate] desc",
"FixHtmlAttachmentLinks": true,
"WorkItemCreateRetryLimit": 5,
"FilterWorkItemsThatAlreadyExistInTarget": false,
"PauseAfterEachWorkItem": false,
"AttachRevisionHistory": false,
"GenerateMigrationComment": true,
"WorkItemIDs": null,
"MaxGracefulFailures": 0,
"SkipRevisionWithInvalidIterationPath": false,
"SkipRevisionWithInvalidAreaPath": false,
"Enrichers": null,
"SourceName": "Source",
"TargetName": "Target",
"RefName": null
}
],
"CommonTools": {
"TfsGitRepositoryTool": {
"Enabled": "True",
"Mappings": [{
}]
},
"StringManipulatorTool": {
"Enabled": "True",
"Manipulators": [
{
"$type": "RegexStringManipulator",
"Description": "Remove invalid characters from the end of the string",
"Enabled": "False",
"Pattern": "[^( -~)\n\r\t]+",
"Replacement": ""
}
],
"MaxStringLength": "1000000"
},
"FieldMappingTool": {
"Enabled": true,
"FieldMaps": [
]
}
Please suggest

[nkdagility-actions-bot[bot]]

Hi there,

ACTION REQUIRED

In order for us to help you will need to provide both the log, and the configration file that you are using.

Generate and Attach Log

Steps:

1. In the Config file, change LogLevel to Debug.
2. Identify a work item ID that exhibits this issue and create a query that only selects this work item.
3. Delete any existing copy of that work item from the target.
4. Run the migration.
5. Comment here with the full Log attached as well as the full (redacted) configration file that you are using.

Your assistance is greatly appreciated!

Thanks, Azure DevOps Migration Tools team

[MrHinsh]

Please provide the full log?

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[kannnababu]

Log.txt
Config.txt

@MrHinsh , Please find the attached documents for the Log file and Config file

[kannnababu]

@MrHinsh , Any update on the issue

[MrHinsh]

Im pretty sure:

 "TfsGitRepositoryTool": {
        "Enabled": "True",
        "Mappings": [{}]
      },

is invalid... this would represent no mappings:

 "TfsGitRepositoryTool": {
        "Enabled": "True",
        "Mappings": []
      },

[kannnababu]

@MrHinsh , Okay, But here the issue is with work items having Changeset
If any work item having changing then I am getting above error and job is cancelled
Please suggest on this.

[MrHinsh]

The log you provided has an error that seams unrelated to links or changes.